The best animated series I've ever seen. Better and more fun than The Simpsons as well.
All of the characters are pretty funny, Zoidberg is hilarious, Bender well... Bender is Bender, and in most episodes he's pretty funny. Fry & Leela as well.
All in all, a very good animated series, and one of the few that I've thought are worthy of seening in the last few years.